Narrow bandwidth analog-to-digital conversion

Details Narrow bandwidth analog-to-digital conversion Narrow bandwidth analog-to-digital conversion

H - Electricity

03

M

350/68, 354/82

H03M 1/20 (2006.01) H03M 1/00 (2006.01) H04N 7/26 (2006.01) H04N 9/455 (2006.01)

Patent

CA 1263177

Abstract A narrow bandwidth analog-to-digital conversion (ADC) system is described in the context of the color burst processing and burst phase detecting circuitry of a digital color television receiver. The ADC includes a dither generator which adds a dither signal to either the analog input signal or to the reference signal used by the ADC. This dither signal increases in magnitude by 1/16 of an LSB value at a rate one-quarter of the burst frequency and changes in sign at one-half of the burst frequency. This signal passes through a low-pass filter in the chrominance channel providing an increase in sample resolution by averaging the samples in a chroma band-pass filter and in the phase detecting circuitry.

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